Michael McCandless created LUCENE-9661: ------------------------------------------
Summary: Another classloader deadlock? Key: LUCENE-9661 URL: https://issues.apache.org/jira/browse/LUCENE-9661 Project: Lucene - Core Issue Type: Bug Affects Versions: master (9.0) Reporter: Michael McCandless The {{java}} processes spawned by our Lucene nightly benchmarks sometimes randomly hang, apparently while loading classes across threads, under contention. I've opened [this {{luceneutil}} issue with some details|https://github.com/mikemccand/luceneutil/issues/89], but [~uschindler] suggested I open an issue here too since he has been seeing this in CI builds too. It is rare, maybe once a week in the nightly benchmarks (which spawn many {{java}} processes with many threads across 128 CPU cores). It is clearly a deadlock – when it strikes, the process hangs forever until I notice and {{kill -9}} it. I posted a coupled {{jstacks}} in the issue above. [~rcmuir] suggested using {{classcycle}} to maybe statically dig into possible deadlocks ... I have not tried that yet. -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@lucene.apache.org For additional commands, e-mail: issues-h...@lucene.apache.org